How are Newbies supposed to learn the Game without masteries and runes?

Lol is supposed to be played with runes and masteries. why in the name of everything don´t you get to play with masteries and like 3 standart sets of runes AP/AD/Tank i am wondering about this for like 6 years now. and after getting matched with an 550 lp challenger player while not being able to pick keystone masteries i am convinced that riots matchmaking algorithm got replaced by random(255).
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